The F-REX from VOCALOID is an audio processor with a visual analyzer that offers real-time control over volume, frequency, and panning. Independently control inside and outside the area of the specific part focused by panning and frequency. Additionally, compression and reverb effects can be applied, while adjusting volume and panning intuitively. The Mac- and Windows-compatible plug-in can be used to create “minus-one” tracks by effectively removing an instrument or voice for Karaoke tracks. Boosting an instrument’s frequency range can also be helpful when trying to learn a song or part.